Rotary intaglio printing press



Aug. 17 1948. w. M. POL-LOCK ROTARY INTAGLIO PBRH'ING PRESS 4.Shoots-Shoot 1 Find Jan. 14, 1944 Aug. 17,, 18. w. M. POLLOCK. 2,447,090

ROTARY INTAGLIO PRIMING PRESS n943- w. M. POLLQCK 2,447,090

ROTARY INTAGLIO PRINTING PRESS F1104 Jan. 14, 1944 4 Sheets-Sheet 3 Aug.17, 1948. w. M. POLLOCK 2,447,090

ROTARY INTAGLIO PRINTING IRES'S Filed Jan. 14, 1944 4 Sheets-Shut 4 illYA/ M 241. 036% WWW W Patented Aug. 17, 1948 UNITED. STATES PATENTOFFICE 2,441,090 ROTARY INTAGLIO PRINTING PRESS Willard M. Pollock,

The Goes Printing This invention relates to new and useful improvementsin inking mechanisms for rotary intaglio presses and more particularlyin improvements in the operation of the doctor blade for such inkingmechanisms.

Objects and advantages of the invention will be set forth in parthereinafter and in part will be obvious herefrom, or may be learned bypractice with the invention, the same being realized and attained bymeans or the instrumentalities and combinations pointed out in theappended claims.

The invention consists in the novel parts, constructions, arrangements,combinations and improvements herein shown and described.

The accompanying drawings, referred to herein and constituting a parthereof, illustrate one embodiment of the invention, and together withthe description, serve to explain the principles of the invention.

Of the drawings: Fig. 1 is a fragmentary vertical transverse sectionthrough a typical arrangement of doctor Glen Ellyn, IlL, assignor toPress Company, Chicago, 111., a corporation of Illinois ApplicationJanuary 14, 1944, Serial No. 518,217

blade and mounting in a rotary intaglio printing Fig. 3 is a detaileddiagrammatic exploded view of the complete doctor blade operatingmechanism according to the present invention;

Fig. 4 is a detailed sectional view of part of the operating mechanismfor imparting movement to the doctor blade, as shown in Figs. 2 and 3;the

means being shown in a central or intermediate position; and

Figs. 5 and 6 are detailed sectional views of the operating means ofFig. 4 but showing the means in an extreme right and extreme leftposition;

respectively. I

Objects of the invention are to provide a doctor blade operatingmechanism constructed and capacitated to operate reliably andefllciently under modern high speed, high quality requirements;

to provide a doctor blade operating mechanism permitting variation ofthe rate of reciprocation of the doctor blade; variation of the lengthof stroke of the doctor blade; variably timing the reciprocation of thedoctor blade in direct proportion to the speed of the press; and smoothoperation of the doctor blade through a preselected cycle of operation;as well as to eflect other objects which are set forth hereinafter orwill be mechanism.

6 Claims. (Cl. 101-169) apparent to those skilled in the art throughpracticing the invention or otherwise.

To this end, in a preferred embodiment herein exemplified, variouscooperating structures and principles are embodied, some of which willbe briefly and generally here indicated.

A supporting and guiding means is firmly supported in flxed positionupon a press frame, and on said guiding means a carriage carrying theentire doctor blade mechanism is reclprocably mounted. Various knowndevices for adjustably positioning the blade carrier and blade withrespect to the design cylinder of the press may be provided, and thesewill be mounted preferably on said carriage.

In the Patent No. 2,178,069,. granted October 31, 1939, there isdisclosed a doctor blade mechanism for a rotary intaglio printing presswhere such blade positioning and regulating means are utilized, mountedupon' the blade supporting car riage, and the present invention,consisting in providing new and improved reciprocating means for adoctor blade mechanism, may be utilized with such a doctor blademechanism as is disclosed in said patent, although the present inventionis in no way to be construed or limited to such form of doctorblademechahism.

In accordance with the present invention fluid operated means, forexample, hydraulic means, are provided for reciprocating the doctorblade To this end, in the preferred embodiment, cam actuated meansoperated from any desired part of the press driving means and thus in adirect proportion to the speed of running of the press, are providedadapted to operate a pilot valve which is so arranged as to control theflow of fluid underpressure to one side or the other of a single pistonmovable in a cylinder. The blade carrier mechanism is directly connectedto the piston so that reciprocating movements thereof may be obtainedunder control of the pilot valve.

It is a feature of this invention that the pilot valve is so arranged asto receive flow of fluid under pressure to either side of the piston fora controllable time which can be altered to suit the desired movement tobe imparted to the doctor blade.

Heretofore the doctor blade has been reciprocated by other than fluidpressure means with the result that while the desired cycle ofacceleration and deceleration has been generally approached. it hasnever been achieved. Particularly, it is greatly desired that, at theextreme end of each stroke, a deceleration is effected, after 3 whichthe blade movement be quickly reversed, that is, without any lag, andprior mechanisms have been largely unable to accomplish this.

Th'e present invention attains this result completely and alsoaccomplishes a complete .control or acceleration and deceleration,namely, permit- 7 ting a preselected cycle of movement to pertain forthe doctor blade.

This is accomplished by utilizing a specific, and variable, cam contourto give a desired or preselected movement to an inner plunger which hasthereon two pistons adapted to cooperate with ports arranged in an outerbarrel surrounding the plunger and slidably mounted within theoutercasing or body of the pilot valve. The ports of the barrel communicateat all positions of the barrel with exit ports connected through thebody of the pilot valve, one of each of these ports communicating with achamber of the cylinder previously referred to, the two chambers ofwhich are on either side of the operating piston.

Thus, movements of the plunger under urge of the cam, result in one orthe other port in the barrel being opened to a source of fluid underpressure admitted to the chamber formed by the pistons and the innerwall of barrel whereby the operating piston will be moved one way or theother to reciprocate the doctor blade.

By changing the shape of the cam it is possible to arrive at a definitecyclic acceleration and retardation of the doctor blade to suit anypurpose. Thus, the cam contour positions the barrel and causesreciprocatory movements thereof, the rate of travel of the doctor blade,as well as the amount of travel, being determined by the movements ofthe barrel and thus being capable of preselection by choice of thecontour of the cam.-

The actual flow of fluid under pressure to the piston within thecylinder is governed by movements of the barrel under influence f therise and fall of the cam, and the rate of such rise and fall willdetermine the rate of flow to said cylinder.

It is desired in practice to provide for such a doctor blade a smootheven movement and the curve or contour of the cam will in practice bechosen to give a deceleration of the doctor slide as it approaches theend of each stroke, a rapid reversal, and a smooth acceleration at thebeginning of each stroke.

The distance between the high point and low point of the cam willdetermine the length of the doctor blade stroke.

Thus, changing the cam contour gives complete variable and adjustablefactors with respect to the cycle of reciprocation of the doctor blade.

Either an edge cam or a box cam can be utilized in this invention ashereinafter brought out.

It is a further feature of this present invention to vary the rate ofreciprocation of the doctor blade independently of any variability ofits cyclic movements.

To this end, the cam is adapted to be driven from a press driven shaft,whereby the speed of driving of the cam will always be proportional tothe speed of driving of the press.

Any desired means of changing the speed of the cam may be utilized suchbeing well known in the art and including change gears, variable geardrives, variable belt drives and the like.

It is a further feature of the present invention to provide for varyingthe length of the stroke of the doctor blade, irrespective of the otherfeatured adjustments and variables given above, and accordingly theother end of the operating piston in the cylinder mentioned above has arod extension which is linked to one end 01' a fulcrumed lever, theother end of which is linked to a shaft attached to one end of thebarrel of the pilot valve.

The fulcrum is so mounted as tobe adjustable between the linked endswhereby a complete variability of the operating stroke of the operatingpiston is achieved since the fulcrumed lever moves under urge of theoperating piston to slide the barrel of the pilot valve relatively tothe pistons on the plunger and variation. of the arc of movement of thefulcrumed lever, thus caused, will alter the length of time ofapplication of fluid under pressure to the cylinder, by movements of thebarrel relative to the plunger.

Also, the linkage above described, may be variable by having the rodextension at one end of the lever and the shaft at the other end mountedfor sliding movement in slots in the lever and adapted to be locked inany desired position in the slots whereby to alter the operative lengthof either the shaft or rod or both.

It is obvious that the barrel of the pilot valve will thus travel in thesame direction as the plunger in an amount determined by the linkage andif the proportions of the linkage are changed, the travel of theoperating piston and thus the doctor blade will decrease or increaseaccordingly.

This invention has been generally described above with respect to a unitfor operating by fluid pressure means a doctor blade mechanism, thisunit comprising a pilot valve and an operating piston and cylinderconnected therewith, but obviously a plurality of such units will beprovided for a press having a plurality of couples, and said units caneach be actuated from a single source of fluid under pressure,conventionally comprising a motor, pump and manifold for multiplecircuit operation with suitable cut-out valves for each unit to silencesame when not needed.

It will be understood that the foregoing general description and thefollowing detailed description as well are exemplary and explanatory butare not restrictive of the invention.

Referring now in detail to the embodiment of the invention illustratedby way of example in the accompanying drawings, as shown in Figs. 1 and2, there is provided an intaglio printing couple comprising a designcylinder l and an impression cylinder 2, which are suitably journalledin the vertical side press frames 3, the web 5 running through theimpression.

The supporting structure of the doctor blade mechanism is connected withand carried by the vertical side frames 3 and also by the vertical wall4 which is part of the ink fountain structure and extends across thepress, being fixed to and carried by, the frame members 3.

The doctor blade mechanism, as here exemplifled, comprises a stationarysupport or base l0, supported by the wall 4 and frame members 3, and maycomprise an upwardly and inwardly inclined wall which constitutes partof the fountain closure.

Guide means are suitably carried by support I! and the entire doctorblade mechanism is reciprocably mounted on the guiding and supportingmeans.

To this end, on the outer face of support III is formed a longhorizontal supporting surface 3|. Supported upon the surface 38 andfastened thereto by any suitable means is a bevelled or undercut guide43, having a shoulder 44 running within its upper edge, the shoulderfitting over the upper horizontal face of surface 33, whereby the guidepiece 43 has hanging support on pad 33.

The carriage which supports the doctor blade mechanism and which slidesreciprocabiy on guide 43 comprises a flat plate 43 having its innersurface contacting the surface of guideway 43, as at 50. The plate 43has a forward extension 53 in sliding engagement with the upper undercutedge of guideway 43.

The doctor blade carrier 60 is mounted on the carriage 43 and is carriedthereby during reciproeating movements, as hereinafter described.

Carrier 60 comprises a longitudinally extending bar having a bottom seat66 and a rearwardly extending flange having a seat 62 upon and withinwhich the immediate support for the doctor blade is mounted.

In the embodied form of mounting the doctor blade l and its carrier, theblade it rests upon a seat formed on a bar 12, bar 12 resting on support6i already mentioned. Clamping fingers 13 hold the bar 72 in place andbolts I4 attach the clamping fingers l3 against the seats 0i and 62. Theblade is held firmly against bar 12 by holders 80 which are clampedthereagainst by a plate BI and screw bolts 82.

If desired, a resilient sealing and backing blade 85 may be mounted injaws 03 and 31 suitably clamped together.

Further details of this specific form of doctor blade carrier, carriageand mounting may be obtained in Patent No. 2,178,069 hereinbeforementioned.

In accordance with the present invention, the embodied form of means forreciprocating the carrier II on the guide 43 include fluid operatingmeans, and hydraulic means are illustrated, specifically.

A plate 90 is formed on the end of the carriage 40 and is attachedthereto by screw bolts 9|. A lug 93 extends therefrom and is adapted tohave attached thereto a rod 35 by a strap 04 bolted to the lug 33, as at06, and preferably formed integrally with rod 05 or permanently attachedthereto as by welding. 7

Means are provided for reciprocating rod 95 whereby to reciprocatedoctor blade carriage 49 on guide 43.

To this end, a piston I00 is located within a cylinder MI and is adaptedto slide therein under hydraulic pressure applied alternately throughports I02 and I03 within the cylinder.

Cylinder IN is supported within a side frame 3 of the press by, forexample, anangle bracket I04 attached by bolts I05 to the cylinder andby bolts I06 to the side frame. A suitable bore I01 throughout the sideframe 3 may equally serve as the means of support, if desired. Fluidunder pressure, such as oil, is supplied to the ports I02 and I03through connecting conduits I03 and I09 respectively, these conduitscommunicating with a pilot valve, hereinafter described, which isadapted to force the fluid under pressure alternately through theconduits I00, and I03, the return fluid being drained back to the supplysource through whichever conduit is not connected to the pressure side.

Cylinder IN is also mechanically connected to the pilot valve generallyindicated at I20, by suitable linkage, to which end, in the embodimentillustrated in Fig. 2, a rod Ill is connected to the side of piston I00opposite to the rod 95 and the end of rod H3 is slip-linked at I2I to apivoted .6 lever I22. Lever I22 is fulcrumed at I23 on a suitablebracket I24 carried by a side frame 3, and attached thereto, as by boltsI25. The other end of lever I22 is slip-linked at I26 to a shaft I21.Shaft I2? is drivingly connected with parts of valve I20 as now moreclearly described.

As shown in Figs. 4, 5 and 6, giving details of three positions of valveI20, oil or like fluid under pressure is adapted to be introduced to a,central part of the valve from any suitable source of supply through aconduit I28 to a port I23.

Valve I20 is provided with an inner plunger valve I3I having two pistonportions I32 and I33 and terminating at one end as a shaft-likeextension I34, mounted for guided movement in the valve body I36 by anend cap I35. Shaft I34 has mounted thereon at its extremity a camfollower I38 which. is preferably rotatably supported on shaft I34, byan anti-friction bearing i39. Cam follower I38 is driven by a cam whichin Fig. 4 is shown as an edge cam I40, this cam being preferably drivenfrom a drive shaft of the press and being so designed as to give adesired acceleration and deceleration of reciprocating movement to theinner plunger valve I3! for the purpose hereinafter described. Whenusing edge cam I40. for operatively moving valve plunger I3I a spring MIis arranged at the other extremity of the plunger, this spring abuttingI against the end of plunger I3I, serving to keep the cam follower I38always in contact withcam I40. The other end of spring I4I abuts againsta flange I42 of asleeve I43 surrounding plunger I3I and adapted to slideon the piston portions I32 and I33 of plunger I3I, the sleeve I43 andflange I42 forming an outer barrel for the valve I20 adapted to slidewithin the body I36.

Attached to the flange I42, or formed integral therewith, if desired, isa shaft I44 which extends beyond the confines of body I36 of the valve,and is mounted in a flanged end thereof I45 to reciprocate. This shaftI44 is connected by suitable linkage to the operating rod II8 ofcylinder IOI and may be the shaft I21 of Fig. 2 or it may be suitablyarticulated thereto,

Various ports are provided in the barrel I43 for the purpose ofpermitting the oil under pressure, supplied through conduit I30, to beintroduced into the interior of barrel I43 and to selectively flowtherefrom to one side or the other of piston I00 in cylinder IOI. Tothis end, port I20 communicates with a port H50 in the barrel I43 andpermits the oil under pressure to be contained within a chamber I5Iformed by the confines of the interior walls of the barrel I43 and thepistonsI 32 and I33.

Body I36 of the valve I20 has two exit ports therein, one exit port I60communicating withan outlet I6I through the wall of the body I36 towhich outlet conduit I09 connects as by a nip =p le I62, while in thesame way the other exit port I65 communicates with an outlet I66 towhich is connected'conduit I08 by a nipple I61.

Barrel I43 has ports I60 and I63 communicating with exit ports I60 andI65, respectively, whereby oil under pressure from chamber I5I can beallowed to flow either through communicating ports I60 and I68 andthence through conduit I09 to port I03, 015 the cylinder IN, or throughcommunicating ports I65 and I69 through conduits I08 to port I02 ofcylinder IN, the movements of the inner plunger urge of cam I40, andparticularly the position of piston parts I 63 and I 69 of the barrel,determining which of con- I32 and I33 relative to entry .ports 7 duitsI08 or I09 receive fluid under pressure. The actual controllingmovements of the various parts of valve I20 can be more clearlyunderstood by reference to the relative positions of Figs. 4, 5 and 6.

In Fig. 4 barrel I43 is in its center position and both ports I68 andI89 thereof are sealed off or closed from connection with chamber I5I bythe pistons I32 and I33. As the cam I40 rotates it causes cam followerI38 and thus plunger I3I to move inwardly or outwardly. In Fig. 5 theparts are shown in their extreme right hand position while in Fig. 6 theparts are shown in extreme left hand position. In Fig. 5 it will be seenthat the oil under pressure from chamber I5I is flowing through the openport I68 through exit port I60 and into conduit I09 to apply pressure topiston I through port I03 and push the piston to the left of Fig. 5.Ports I69 and I65 are sealed off from pressure fluid by piston I33 butcan allow drainage back of fluid through port I02, conduit I08 into areturn chamber I15 from whence it can be returned to the source ofsupply.

Due to rod II8 being moved over to the position shown, lever I10 isplaced in position H011 and shaft I44 is in position I44a thus movingthe barrel I43 to follow the plunger and move over to an extreme rightposition.

The positions of Fig. 6 are exactly opposite to those of Fig. 5, thepressure side being on the left throughport I02, conduit I08, ports I65and I89, with the drainage through conduit I09, the lever I10 thenoccupying position "Oh and lever I44 being in position I44b with thebarrel in its extreme left hand position. The chamber I16 now receivesdrainage.

Thus, by this valve arrangement, a relatively small movement of theshaft I34 from cam follower I38 coupled with following movements of thebarrel I43 give a maximum controlled movement of piston I00 in cylinderI0 I.

The cam shown in Figs, and 6 is a box cam I11, so that the spring I4Imay be dispensed with in such a modification of cam form.

In order to prevent build up of pressure against the flange I42 ofbarrel I43 and to permit feeding back into drainage chamber I18, holesI18 in said flange may be drilled, as shown.

The pistons I 32 and I33 may be of cylindrical form but in such event,as the ports I88 or I69 are cleared by the pistons I32 or I33 and thusare placed in communication with pressure chamber I5I an immediate flowof fluid under the full pressure will take place and will remain at thesame pressure until the opened port is closed again. In use, the barrelI43 closely follows movement of the inner plunger BI, and in order toprovide for adequate flow through the various .ports of the fluid underpressure, the pistons I32 and I33 will be preferably formed as clearly.

shown in Figs. 4, 5 and 6 with both advance and return edges tapered.

In Fig. 3 an exploded view of the whole apparatus for operating thedoctor blade mechanism is shown. Motor I80 drives pump I 8I and the oilthus under pressure is passed through conduit I82 to a manifold I83. Asuitable pressure guage I84 is associated with manifold I83. Conduit I85leads the fluid under pressure to the valve I20, a suitable cut-offvalve I88 for silencing the unit when desired, being provided in theline, More than one doctor blade reciprocating unit may be operatedfromthe one source of supply of fluid under pressure, and therefore abranch line I81 is shown from manifold I83 each of which may beidentical with the unit illustrated comprising valve I20, cylinder IN,and operating connections. Return or drainage oil from the chembers I15and I16 may be taken into the sump I81 of pump I8I through conduit I88,the drainage from other units being also passed thereto by conduit I89.

In Fig. 3, cam follower I38 is shown in contact with edge cam I40 whichis driven from the press at an adjustable speed.

To this end, cam I40 may be pivotally mounted in a bracket I on a shaftI9I, on which shaft a pair of pulleys I92 each with an inclined face aresplined and are spring urged toward each other. A V shaped belt I93 isdriven from a pulley I94 and is adapted to simultaneously contact bothpulleys on the inclined faces thereof in such way that, as the belt istightened about the pulleys, the two pulleys move away from each otherand the belt contacts a different peripheral portion, whereby therelative speed of driving cam I40 is changed.

An idler I95 mountedto be adjusted by a screw I98 against a spring I91rides on the upper face of belt I93 and by adjusting the idler I95. theposition of belt I93 with respect to the inclined faces of pulleys I92is altered, to vary the driving speed, at will.

Driving pulley I94 is driven from any suitable moving shaft of the pressby a belt I98 and a pulley I99 mounted on shaft 200 in a bracket MI.

The linkage between the operating piston I00 and the barrel shaft I44 inFig. 3 is of somewhat modified form. Rod H8 is mounted in a bearingblock 20I for support and is linked at 202 to an extension arm 203, thelink 202 being pivotal. Arm 203 is slip-linked in a groove 204 in onearm of a fulcrumed lever 205, slip-link 206 being adapted. to beadjusted and clamped in place longitudinally of lever 205.

In the same manner, shaft I44 is supported by a bearing block 208 and islinked at 209 to an extension 2I0 which is slip-linked at 2 II in agroove 2I2 in the other arm of lever 205.

Furthermore, fulcrum 2I3 of lever 205 is mounted in a block 2I4, theblock being vertically slidable on a guide 2I5. Adjustments of thefulcrum point 2I3 may be made by screw 2 I6 which is carried by anextension 2I1 of said slide, a lock screw 2i 8 being provided forpreventing accidental movement of the fulcrum.

By altering the position of the fulcrum the length of stroke of thedoctor blade can be varied and by altering the angular attachment of theslip-links 206 and 2 further adjustment of the length of the operativethrust exerted on the blade carrier can be made.

Thus, there is provided by the present invention, new and improvedactuatingmeans for reciprocating the doctor blade mechanism, such meansproviding smooth, economical operation and being hydraulic actuated oractuated by equivalent fluid pressure means with additional features ofcontrol and adjustability including means for varying the rate ofreciprocation of the doctor blade; means tovary the length of stroke ofthe doctor blade; and means for timing the reciprocation to vary indirect proportion with the speed of the press.

The invention in its broader aspects is not limited to the specificmechanisms shown and described but departures may be made therefromvention and without sacrificing its chief advantages.

What I claim is:

1. A rotary intaglio inking mechanism including in combination a guide,a doctor blade carrier mounted for reciprocation thereon, and fluidpressure means for reciprocating said doctor blade carrier including apilot valve having an innner plunger and a barrel surrounding same andmounted for relative sliding movement therewith, ports in said barrelcommunicating with exit ports through the body of said pilot valve,means for conducting fluid under pressure to the interior of said pilotvalve, means to move said barrel and plunger to periodically permit flowof said fluid under pressure through first one and then the other ofsaid exit ports, a piston within a cylinder, ports on either side ofsaid piston, means to connect said exit ports with said cylinder ports,whereby said piston is reciprocated under flow of pressure from saidpilot valve, 2. driving rod from said piston to said blade carrier, anda connection between the other side of the piston and the barrel of saidpilot valve whereby movements of said barrel relative to said plungermay be effected.

2. A rotary intaglio inking mechanism including in combination a guide,a doctor blade carrier mounted for reciprocation thereon, and fluidpressure means for reciprocating said doctor blade carrier including apilot valve having an inner plunger and a barrel surrounding same andmounted for relative sliding movement therewith, ports in said barrelcommunicating with exit ports through the body of said pilot valve,means for conducting fluid under pressure to the interior of said pilotvalve, means to move said barrel and plunger to periodically permit flowof said fluid under pressure through first one and then the other ofsaid exit ports, a piston within a cylinder, ports on either side ofsaid piston, means to connect said exit ports with said cylinder ports,whereby said piston is reciprocated under flow of pressure from saidpilot valve, a driving rod from said piston to said blade carrier, and aconnection between the other side of the piston and the barrel of saidpilot valve whereby movements of said barrel relative to said plungermay be effected, said connection being a linkage including a fulcrumedlever, the fulcrum of which can be varied relative to the piston and thebarrel to vary the length of stroke of the blade carrier.

3. A rotary intaglio inking mechanism including in combination a guide,a doctor blade carrier reciprocably mounted thereon, a hydraulicallyoperated piston attached to said carrier adapted to receive fluid underpressure on one side or the other to reciprocate said carrier, a pilotvalve having two internal moving parts, cam means to move one partrelative to the other,

means to move the other part under urge of said rier reciproeablymounted thereon, a hydraulically operated piston attached to saidcarrier adapted to receive fluid under pressure on one side or the otherto reciprocate said carrier, a pilot valve having two internal movingparts, cam means to move one part relative to the other in predeterminedvariable amounts, means to move the other part in predetermined variableamounts under urge of said piston to follow the first part, and means toapply fluid under pressure in predetermined variable amounts to saidpiston from said pilot valve under control of the relative movements ofsaid parts.

5. A rotary intaglio inking mechanism including in combination a guide,a doctor blade carrier mounted for reciprocation thereon, fluid pressuremeans for reciprocating said carrier, a pilot valve governing theapplication of fluid pressure to said reciprocating means, andmechanical means acting to operate said pilot valve to determine therate of flow of fluid under pressure to said reciprocating means in acontinuous accelerating and decelerating cycle, whereby the cycle ofmovement of said carrier follows a predeterminedacceleration-deceleration pattern,

said mechanical means including a cam operating on a moving part of saidpilot valve, and linkage between another moving part of said pilot valveconnected to said reciprocating means to cause said other moving part ofthe pilot valve to follow the stroke of said reciprocating means in apredetermined proportion.

6. A rotary intaglio inking mechanism including in combination a guide,a doctor blade carrier mounted for reciprocation thereon, fluid pressuremeans for reciprocating said carrier, a pilot valve governing theapplication of fluid pressure to said reciprocating means, andmechanical means acting to operate said pilot valve to determine therate of flow of fluid under pressure to said reciprocating means in acontinuous accelerating and decelerating cycle, whereby the cycle ofmovement of said carrier follows a predeterminedaccelerationdeceleration pattern,

said mechanical means including a cam operating on a moving part of saidpilot valve, and linkage between another moving part of said pilot valveconnected to said reciprocating means to cause said other moving part ofthe pilot valve to follow the stroke of said reciprocating means in apredetermined proportion, said linkage being adjustable to alter theproportion of following of the stroke of the reciprocating means assumedby said other moving part of the pilot valve, whereby the length oftravel of said carrier can be adjusted independently of the amount offluid pressure supplied.

' WILLARD M. POLLOCK.

REFERENCES CITED The following references are of record in the file ofthis patent:

FOREIGN PATENTS Number Country Date 753,303 France Aug. '7, 1933 512,135Germany Feb. 26, 1932

